Nitrogen metering pry

Abstract

The utility model relates to the technical field of metering prying devices, and discloses a nitrogen metering prying device which comprises a prying device base, a nitrogen conveying pipeline arranged on the prying device base, a nitrogen metering pipeline and a nitrogen pressure relief pipeline, and the nitrogen conveying pipeline comprises a first nitrogen inlet, a first flow meter and a first nitrogen outlet. The nitrogen metering pipeline comprises a second nitrogen inlet, a second flow meter and a second nitrogen outlet, the nitrogen pressure relief pipeline comprises a third nitrogen inlet and a third nitrogen vent, and the second nitrogen inlet of the nitrogen metering pipeline is formed in the position, behind the first flow meter, of the nitrogen conveying pipeline; and a third nitrogen inlet of the nitrogen pressure relief pipeline is arranged on a pipeline in front of the first flow meter of the nitrogen conveying pipeline. The nitrogen metering pry is used for injecting nitrogen produced by a nitrogen vehicle into a well in a butt joint mode, the nitrogen injection amount can be adjusted according to the oil and gas exploitation condition in the well, and the nitrogen injection amount of a nitrogen conveying pipeline can be calculated more accurately.

Description

Technical Field

[0001] The utility model relates to the technical field of metering skids, in particular to a nitrogen metering skid. Background Art

[0002] Skid-mounted equipment combines pipelines, pressure vessels, control cabinets, electrical instruments, and other fixtures into a single unit according to a specific process flow. This unit is then secured to a steel structure or other structure (called a skid) through welding or bolting, achieving diverse functions. This equipment requires no on-site assembly and can be used directly. With the development of industrial machinery in oil and gas fields, integration has become a common equipment requirement in the petrochemical and fine chemical industries. Skid-mounted equipment offers a compact structure, a small footprint, and significant space savings. While aesthetically pleasing, it significantly reduces on-site installation workload.

[0003] Wellhead gas accumulation is an oil and gas field development technology that injects gas into the well, using the gas pressure to push fluids in the reservoir to the surface, thereby achieving efficient oil and gas recovery. During the oil and gas extraction process, as oil and gas are extracted from the wellhead, the downhole pressure decreases due to oil and gas loss. To maintain downhole pressure and prevent the wellhead from drying up or production decline, a corresponding amount of gas must be injected to maintain pressure. In practice, the amount of gas injected needs to be adjusted based on the actual conditions of the well, oil and gas production, downhole pressure, and other factors to achieve optimal production results.

[0004] During wellhead gas accumulation operations, nitrogen trucks are used as the gas source to avoid the need for pressure vessels. Since the nitrogen injection rate fluctuates, the nitrogen truck's flow rate and pressure are fixed, and the flow rate far exceeds actual usage. Without pressure vessels to store excess nitrogen at the wellsite, a skid-mounted device is needed to connect and inject the nitrogen produced by the truck into the well, adjusting the nitrogen injection rate based on the oil and gas production conditions within the well. Utility Model Content

[0005] In order to overcome the problems existing in the related art, the utility model provides a nitrogen metering skid for dynamically injecting nitrogen produced by a nitrogen truck into an oil well according to the needs of wellhead gas polymerization operations.

[0006] The technical solution adopted by the utility model is: a nitrogen metering skid, comprising a skid seat, a nitrogen delivery pipeline, a nitrogen metering pipeline and a nitrogen pressure relief pipeline, wherein the nitrogen delivery pipeline, the nitrogen metering pipeline and the nitrogen pressure relief pipeline are arranged on the skid seat;

[0007] The nitrogen delivery pipeline includes a first nitrogen inlet, a first flowmeter and a first nitrogen outlet; the nitrogen metering pipeline includes a second nitrogen inlet, a second flowmeter and a second nitrogen outlet; the nitrogen pressure relief pipeline includes a third nitrogen inlet and a third nitrogen vent;

[0008] The second nitrogen inlet of the nitrogen metering pipeline is arranged on the pipeline after the first flowmeter of the nitrogen delivery pipeline, and the third nitrogen inlet of the nitrogen pressure relief pipeline is arranged on the pipeline before the first flowmeter of the nitrogen delivery pipeline.

[0009] Furthermore, the nitrogen delivery pipeline is provided with the first nitrogen inlet, high-pressure gate valve, emergency shut-off valve, damper, first pressure transmitter, first flow meter, first electric regulating valve, first oxygen analyzer, second pressure transmitter, check valve and first nitrogen outlet in sequence.

[0010] Furthermore, the second nitrogen inlet is provided on the pipeline between the first flow meter and the first electric regulating valve.

[0011] Furthermore, the third nitrogen inlet is provided on the pipeline between the damper and the first flow meter.

[0012] Furthermore, the nitrogen pressure relief pipeline includes the third nitrogen inlet, the safety valve and the third nitrogen vent which are sequentially connected through a pipeline, and the third nitrogen vent is provided with a first muffler.

[0013] Furthermore, the nitrogen pressure relief pipeline also includes a nitrogen pressure relief branch, which is provided with a pressure interlock valve. The air inlet of the nitrogen pressure relief branch is arranged on the pipeline between the damper and the first flowmeter, and the air outlet of the nitrogen pressure relief branch is connected to the third nitrogen vent of the nitrogen pressure relief pipeline.

[0014] Furthermore, the nitrogen metering pipeline is provided with the second nitrogen inlet, the second flow meter, the second electric regulating valve, the second oxygen content analyzer and the second nitrogen outlet in sequence, and the second nitrogen outlet is provided with a second muffler.

[0015] Furthermore, the first nitrogen inlet is provided with an oil filter, and / or the first nitrogen outlet is provided with an oil filter.

[0016] Furthermore, the nitrogen metering skid further includes a controller, an explosion-proof control cabinet is provided on the skid seat, and the controller is arranged in the explosion-proof control cabinet.

[0017] Furthermore, the controller is a PLC controller, and the emergency shut-off valve, the first flow meter, the first electric regulating valve, the second flow meter and the second electric regulating valve are electrically connected to the PLC controller.

[0018] The nitrogen metering skid of the present invention has the following technical effects: a nitrogen delivery pipeline, a nitrogen metering pipeline and a nitrogen pressure relief pipeline are provided on the skid base; the first nitrogen inlet of the nitrogen delivery pipeline is connected to the nitrogen vehicle outlet, and the first nitrogen outlet is connected to the oil well air inlet pipe. The nitrogen delivery pipeline is used to inject the nitrogen produced by the nitrogen vehicle into the oil well. In order to be able to dynamically adjust the nitrogen injection amount, a nitrogen metering pipeline is designed on the pipeline after the first flowmeter of the nitrogen delivery pipeline. The second nitrogen outlet of the nitrogen metering pipeline is a venting port. By adjusting the nitrogen venting amount of the nitrogen metering pipeline, the purpose of dynamically adjusting the nitrogen injection amount of the nitrogen delivery pipeline is achieved. The nitrogen metering pipeline is designed with a second flowmeter for calculating the nitrogen venting amount of the nitrogen metering pipeline. In conjunction with the first flowmeter, the nitrogen injection amount of the nitrogen delivery pipeline can be calculated more accurately. A nitrogen pressure relief pipeline is designed on the pipeline before the first flow meter of the nitrogen delivery pipeline for overpressure protection, ensuring that the entire skid-mounted equipment will not be damaged by overpressure such as tooling parts due to excessive nitrogen injected by the nitrogen truck and unable to be injected into the oil well in time or vented through the nitrogen metering pipeline.

[0019] Other features and advantages disclosed in the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0021] Figure 1 The figure is a schematic diagram of the overall structure of a nitrogen metering skid from a top view according to an exemplary embodiment.

[0022] Figure 2 The figure is a schematic diagram of the overall structure of a nitrogen metering skid from a side view according to an exemplary embodiment.

[0023] Figure 3 The figure is a schematic diagram showing the internal circuit connections of a nitrogen metering skid according to an exemplary embodiment.

[0024] Figure numerals: 1. Oil reed; 2. High-pressure gate valve; 3. Emergency shut-off valve; 4. Damper; 5. Safety valve; 6. First pressure transmitter; 7. Pressure interlock valve; 8. Explosion-proof control cabinet; 9. First flow meter; 10. First silencer; 11. First electric control valve; 12. First oxygen analyzer; 13. Second pressure transmitter; 14. Check valve; 15. Second flow meter; 16. Second electric control valve; 17. Second oxygen analyzer; 18. Second silencer; 19. PLC controller; 20. Third flow meter. DETAILED DESCRIPTION

[0025] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0026] like Figure 1 、 Figure 2 The figure shows an exemplary embodiment of the present invention. The nitrogen metering skid of the present invention includes a skid base, a nitrogen delivery pipeline, a nitrogen metering pipeline, and a nitrogen pressure relief pipeline. The nitrogen delivery pipeline, nitrogen metering pipeline, and nitrogen pressure relief pipeline are arranged on the skid base. The nitrogen delivery pipeline includes a first nitrogen inlet, a first flowmeter 9, and a first nitrogen outlet. The nitrogen metering pipeline includes a second nitrogen inlet, a second flowmeter 15, and a second nitrogen outlet. The nitrogen pressure relief pipeline includes a third nitrogen inlet and a third nitrogen vent. The second nitrogen inlet of the nitrogen metering pipeline is arranged on the pipeline after the first flowmeter 9 of the nitrogen delivery pipeline, and the third nitrogen inlet of the nitrogen pressure relief pipeline is arranged on the pipeline before the first flowmeter 9 of the nitrogen delivery pipeline.

[0027] The present invention is aimed at avoiding the use of pressure vessels at oil well sites. The nitrogen produced by nitrogen trucks has a fixed flow rate and pressure, and cannot be directly connected to the oil well air inlet pipe to inject nitrogen into the oil well, so this nitrogen metering skid is designed. The operating environment of oil field well sites is complex, and well site operations require frequent operations, such as drilling, completion, and oil production. The use of pressure vessels will occupy a large area, limiting the flexibility and efficiency of operations. On the other hand, the downhole fluid of oil wells usually contains corrosive components, and pressure vessels are easily corroded, reducing their service life and safety. Therefore, the equipment commonly used at well sites is generally designed and material selected for these special environments to improve durability. National regulations and safety standards also have strict regulations and restrictions on the use of pressure vessels at oil field well sites. Therefore, oil field well sites are more inclined to use other types of equipment and designs to meet safety, economy and operational requirements.

[0028] During wellhead gas accumulation operations, well sites often use nitrogen trucks as a gas source to avoid the presence of pressure vessels. Because the nitrogen flow rate and pressure produced by the nitrogen truck are fixed, and the flow rate far exceeds actual usage, the nitrogen injection volume required by the oil well fluctuates, making it impossible to directly pipe the nitrogen produced by the nitrogen truck into the oil well. Therefore, the present invention employs a nitrogen metering skid to introduce nitrogen produced by the nitrogen truck into the skid, which dynamically adjusts the amount of nitrogen injected into the oil well. The skid comprises a nitrogen delivery pipeline, a nitrogen metering pipeline, and a nitrogen pressure relief pipeline. The first nitrogen inlet of the nitrogen delivery pipeline is connected to the nitrogen truck, and the first nitrogen outlet is connected to the oil well's air inlet pipe. A nitrogen metering pipeline is provided on the pipeline following the first flowmeter 9 of the nitrogen delivery pipeline. The second nitrogen outlet of the nitrogen metering pipeline serves as a vent, allowing excess nitrogen produced by the nitrogen truck to be directly discharged. The nitrogen metering pipeline is provided with a second flow meter 15 for counting the nitrogen discharge amount of the nitrogen metering pipeline. Cooperating with the first flow meter 9, the nitrogen injection amount in the nitrogen delivery pipeline can be calculated more accurately.

[0029] Installing a second flowmeter 15 on the nitrogen metering pipeline simplifies its use and extends its service life. Fluid flow in the nitrogen metering pipeline is more stable, and the second flowmeter 15 provides more accurate measurements. Conversely, if a flowmeter is installed near the first nitrogen outlet section of the nitrogen delivery pipeline, the complex pressure conditions within the oil well will be transmitted to the first nitrogen outlet section, affecting the flow of gas there and causing unstable nitrogen flow. This instability can affect the accuracy and reliability of the flowmeter. Furthermore, under the harsh environment of oil well gas lift operations, the flowmeter may face significant wear and corrosion risks, which also affects its service life and measurement accuracy. Two flowmeters are installed within the nitrogen metering skid: one on the nitrogen delivery pipeline and one on the nitrogen metering pipeline. The first flowmeter 9 on the nitrogen delivery pipeline serves as the primary flowmeter, used to calculate the total nitrogen flow rate. The second flowmeter 15 on the nitrogen metering pipeline serves as the secondary flowmeter, used to calculate the nitrogen venting volume. The two flowmeters work together to calculate the nitrogen injection volume. This allows for more data points to be obtained for cross-validation, thereby improving overall measurement accuracy. This method allows comparison and calibration between total flow and bypass flow, ensuring the reliability of measurement results.

[0030] A nitrogen pressure relief pipeline is provided on the pipeline before the first flow meter 9 of the nitrogen delivery pipeline for overpressure protection. When the nitrogen metering skid has too much nitrogen and the pressure is too high, the pressure can be relieved through the nitrogen pressure relief pipeline without damaging the first flow meter 9, the second flow meter 15 and other precision equipment in the metering skid.

[0031] For example, Figure 1 、 Figure 2As shown, in the exemplary embodiment disclosed in the present utility model, the nitrogen delivery pipeline is provided with a first nitrogen inlet, a high-pressure gate valve 2, an emergency shut-off valve 3, a damper 4, a first pressure transmitter 6, a first flowmeter 9, a first electric regulating valve 11, a first oxygen analyzer 12, a second pressure transmitter 13, a check valve 14, and a first nitrogen outlet. The second nitrogen inlet is provided in the pipeline between the first flowmeter 9 and the first electric regulating valve 11. The third nitrogen inlet is provided in the pipeline between the damper 4 and the first flowmeter 9.

[0032] The nitrogen delivery pipeline of the nitrogen metering skid of the present invention is connected with the above-mentioned tooling and measuring instruments in order. This order is only a preferred order. The position of the relevant instruments and meters can also be adjusted without affecting the overall function. The second nitrogen inlet is arranged between the first flowmeter 9 and the first electric control valve 11, so that the nitrogen metering pipeline can adjust the nitrogen discharge amount and thus control the nitrogen injection amount of the nitrogen delivery pipeline. The second nitrogen inlet is located after the first flowmeter 9 so that the two flowmeters can cooperate with each other to more accurately measure the nitrogen injection amount. The third nitrogen inlet is arranged on the pipeline between the damper 4 and the first flowmeter 9 to ensure that the instruments and meters of the nitrogen delivery pipeline and the nitrogen metering pipeline located behind the third nitrogen inlet will not be damaged by overpressure. If the position of the relevant measuring instruments is adjusted, other instruments are allowed to be present on the pipeline between the first flowmeter 9 and the first electric control valve 11 and between the damper 4 and the first flowmeter 9 without affecting the overall function.

[0033] For example, the nitrogen pressure relief line includes a third nitrogen inlet, a safety valve 5, and a third nitrogen vent, all connected in sequence via a pipeline. The third nitrogen vent is equipped with a first muffler 10. The nitrogen pressure relief line also includes a nitrogen pressure relief branch, equipped with a pressure interlock valve 7. The nitrogen pressure relief branch's air inlet is located on the pipeline between the damper 4 and the first flowmeter 9, and its air outlet is connected to the third nitrogen vent of the nitrogen pressure relief line. The nitrogen metering line is sequentially equipped with a second nitrogen inlet, a second flowmeter 15, a second electric regulating valve 16, a second oxygen analyzer 17, and a second nitrogen outlet. The second nitrogen outlet is equipped with a second muffler 18.

[0034] The nitrogen metering skid of this utility model is equipped with a safety valve 5 on the nitrogen pressure relief pipeline. When the pressure in the nitrogen delivery pipeline and the nitrogen metering pipeline reaches the threshold of the safety valve 5, the safety valve 5 will open, and the nitrogen will be discharged through the nitrogen pressure relief pipeline. The precision instruments and equipment within the nitrogen metering skid will not be squeezed and damaged by excessive pipeline pressure. The nitrogen pressure relief pipeline also includes a nitrogen pressure relief branch, which is equipped with a pressure interlock valve 7. By adjusting the switching pressure value of the pressure interlock valve 7, the pressure relief threshold of the nitrogen pressure relief pipeline can be more flexibly determined. The third nitrogen vent and the second nitrogen outlet are equipped with silencers to effectively reduce the noise generated by the nitrogen flow out of the pipeline.

[0035] For example, Figure 1 、 Figure 2 As shown, the first nitrogen inlet of the nitrogen metering skid of the present invention is equipped with an oil filter 1, and / or the first nitrogen outlet is equipped with an oil filter 1. Preferably, in the exemplary embodiments disclosed herein, both the first nitrogen inlet and the first nitrogen outlet are equipped with an oil filter 1. The installation of the oil filter 1 at the first nitrogen inlet and outlet facilitates connection of the nitrogen metering skid with a nitrogen truck and the oil well intake pipe.

[0036] For example, Figure 3 As shown, the nitrogen metering skid of the present invention also includes a controller. An explosion-proof control cabinet 8 is provided on the skid base, and the controller is housed in the explosion-proof control cabinet 8. The controller is a PLC controller 19, and the emergency shut-off valve 3, the first flow meter 9, the first electric regulating valve 11, the second flow meter 15, and the second electric regulating valve 16 are electrically connected to the PLC controller 19.

[0037] In the exemplary embodiment of the present disclosure, an explosion-proof control cabinet 8 is installed on the skid, housing a PLC controller 19. The emergency shutoff valve 3, first flowmeter 9, first electric control valve 11 on the nitrogen delivery pipeline, and second flowmeter 15 and second electric control valve 16 on the nitrogen metering pipeline are all electrically connected to the PLC controller 19. A third flowmeter 20 is also installed at the oil and gas outlet of the oil well, also electrically connected to the PLC controller 19. This information is then transmitted to the PLC controller 19, which controls the first and second electric control valves 11 and 16 to inject nitrogen into the well. The first flowmeter 9 uploads the total nitrogen flow of the nitrogen delivery pipeline to the PLC controller 19, and the second flowmeter 15 uploads the nitrogen discharge volume of the nitrogen metering pipeline to the PLC controller 19, so that the PLC controller 19 can accurately inject an appropriate amount of nitrogen into the well by controlling the first electric regulating valve 11 and the second electric regulating valve 16, thereby ensuring the mining efficiency of the oil well and preventing the wellhead from drying up or reducing production.

[0038] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0039] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0040] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A nitrogen metering skid, characterized in that: It includes a skid, a nitrogen delivery pipeline, a nitrogen metering pipeline and a nitrogen pressure relief pipeline, wherein the nitrogen delivery pipeline, the nitrogen metering pipeline and the nitrogen pressure relief pipeline are arranged on the skid; The nitrogen delivery pipeline includes a first nitrogen inlet, a first flowmeter and a first nitrogen outlet; the nitrogen metering pipeline includes a second nitrogen inlet, a second flowmeter and a second nitrogen outlet; the nitrogen pressure relief pipeline includes a third nitrogen inlet and a third nitrogen vent; The second nitrogen inlet of the nitrogen metering pipeline is arranged on the pipeline after the first flowmeter of the nitrogen delivery pipeline, and the third nitrogen inlet of the nitrogen pressure relief pipeline is arranged on the pipeline before the first flowmeter of the nitrogen delivery pipeline.

2. The nitrogen metering skid according to claim 1, characterized in that: The nitrogen delivery pipeline is provided with the first nitrogen inlet, a high-pressure gate valve, an emergency shut-off valve, a damper, a first pressure transmitter, the first flow meter, a first electric regulating valve, a first oxygen analyzer, a second pressure transmitter, a check valve and the first nitrogen outlet in sequence.

3. The nitrogen metering skid according to claim 2, characterized in that: The second nitrogen inlet is provided on a pipeline between the first flow meter and the first electric regulating valve.

4. The nitrogen metering skid according to claim 2, characterized in that: The third nitrogen inlet is provided on the pipeline between the damper and the first flow meter.

5. The nitrogen metering skid according to claim 2, characterized in that: The nitrogen pressure relief pipeline includes the third nitrogen inlet, the safety valve and the third nitrogen vent which are sequentially connected through a pipeline, and the third nitrogen vent is provided with a first muffler.

6. The nitrogen metering skid according to claim 2, characterized in that: The nitrogen pressure relief pipeline also includes a nitrogen pressure relief branch, which is provided with a pressure interlock valve. The air inlet of the nitrogen pressure relief branch is arranged on the pipeline between the damper and the first flowmeter, and the air outlet of the nitrogen pressure relief branch is connected to the third nitrogen vent of the nitrogen pressure relief pipeline.

7. The nitrogen metering skid according to claim 2, characterized in that: The nitrogen metering pipeline is sequentially provided with the second nitrogen inlet, the second flow meter, the second electric regulating valve, the second oxygen content analyzer and the second nitrogen outlet, and the second nitrogen outlet is provided with a second muffler.

8. The nitrogen metering skid according to claim 1, characterized in that: The first nitrogen inlet is provided with an oil filter, and / or the first nitrogen outlet is provided with an oil filter.

9. The nitrogen metering skid according to claim 7, characterized in that: The nitrogen metering skid further includes a controller. An explosion-proof control cabinet is provided on the skid seat, and the controller is arranged in the explosion-proof control cabinet.

10. The nitrogen metering skid according to claim 9, characterized in that: The controller is a PLC controller, and the emergency shut-off valve, the first flow meter, the first electric regulating valve, the second flow meter and the second electric regulating valve are electrically connected to the PLC controller.

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